Documentation: DT bindings: add more Tegra chip compatible strings

Align compatible strings for several IP blocks present on Tegra chips
with the latest doctrine from the DT maintainers:

http://marc.info/?l=devicetree&m=142255654213019&w=2

The primary objective here is to avoid checkpatch warnings, per:

http://marc.info/?l=linux-tegra&m=142201349727836&w=2

DT binding text files have been updated for the following IP blocks:

- PCIe
- SOR
- SoC timers
- AHB "gizmo"
- APB_MISC
- pinmux control
- UART
- PWM
- I2C
- SPI
- RTC
- PMC
- eFuse
- AHCI
- HDA
- XUSB_PADCTRL
- SDHCI
- SOC_THERM
- AHUB
- I2S
- EHCI
- USB PHY

N.B. The nvidia,tegra20-timer compatible string is removed from the
nvidia,tegra30-timer.txt documentation file because it's already
mentioned in the nvidia,tegra20-timer.txt documentation file.

This second version takes into account the following requests from
Rob Herring <[email protected]>:

- Per-IP block patches have been combined into a single patch

- Explicit documentation about which compatible strings are actually
  matched by the driver has been removed.  In its place is implicit
  documentation that loosely follows Rob's prescribed format:

  "Must contain '"nvidia,<chip>-pcie", "nvidia,tegra20-pcie"' where
   <chip> is tegra30, tegra132, ..." [...]  "You should attempt to
   document known values of <chip> if you use it"

Signed-off-by: Paul Walmsley <[email protected]>
Cc: Alexandre Courbot <[email protected]>
Cc: Dylan Reid <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Jingchang Lu <[email protected]>
Cc: John Crispin <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mikko Perttunen <[email protected]>
Cc: Murali Karicheri <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Pawel Moll <[email protected]>
Cc: Peter De Schrijver <[email protected]>
Cc: Peter Hurley <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Stephen Warren <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: "Terje Bergström" <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Tuomas Tynkkynen <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Zhang Rui <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Eduardo Valentin <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

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