staging: vc04_services: rename variables containing bm2835_* to bcm2835_*

staging: vc04_services: rename variables containing bm2835_* to bcm2835_*

In the kernel, all names related to the chip BCM2835 are always named
bcm2835_*. To avoid confusion, and to make things more consistent,
rename all variables using bm2835_* to bcm2835_*.

While at it, some realignments were made to improve readability.

Suggested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Gaston Gonzalez <gascoar@gmail.com>
Link: https://lore.kernel.org/r/a0af5deacebc2da9b21772c7677e1a9627edbed6.1641414449.git.gascoar@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>