bcm2835: update 1.71 -> 1.73
Update to version 1.73:
- Fixed some inconsistent indenting in bcm2835.c that triggers
warnings for some people.
- Added Timeout checks to bcm2835_i2c_write() in case of IO
problems. New reason code BCM2835_I2C_REASON_ERROR_TIMEOUT
added.
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>