wifi: brcmfmac: Add optional lpo clock enable support

WiFi modules often require 32kHz clock to function. Add support to
enable the clock to PCIe driver and move "brcm,bcm4329-fmac" check
to the top of brcmf_of_probe. Change function prototypes from void
to int and add appropriate errno's for return values that will be
send to bus when error occurred.

Co-developed-by: Ondrej Jirman <[email protected]>
Signed-off-by: Ondrej Jirman <[email protected]>
Co-developed-by: Arend van Spriel <[email protected]>
Signed-off-by: Arend van Spriel <[email protected]>
Reviewed-by: Sai Krishna <[email protected]>
Signed-off-by: Jacobe Zang <[email protected]>
Reviewed-by: Sebastian Reichel <[email protected]>
Tested-by: Sebastian Reichel <[email protected]> # On RK3588 EVB1
Acked-by: Arend van Spriel <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://patch.msgid.link/[email protected]

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