i2c: bcm2835: clear reserved bits in S-Register

The datasheet mentions on page 31 that the bits 10-31 must be read as
don't care and written as 0.
https://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

We cannot guarantee that we read bits 10-31 as always 0 (because the
datasheet says read as don't care). We clear the bits with a bitmask to
prevent writing back unknown data at the reserved bits.

Signed-off-by: Silvan Wicki <[email protected]>
Acked-by: Stephen Warren <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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