can: at91_can: rename AT91_MB_RX_MASK to AT91_IRQ_MB_RX
can: at91_can: rename AT91_MB_RX_MASK to AT91_IRQ_MB_RX

... and use it for AT91_NEXT_MB_MASK,
AT91_IRQ_MB_RX and AT91_IRQ_MB_RX, too.

Signed-off-by: Marc Kleine-Budde <4a0ea1158d3cc63151119c05b1bff00c0bdbf421@pengutronix.de>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs