[media] tef6862: fix warning on avr32 arch

On avr32 arch, we get those warnings:
	drivers/media/radio/tef6862.c:59:1: warning: "MODE_SHIFT" redefined
	In file included from /devel/v4l/ktest-build/arch/avr32/include/asm/ptrace.h:11,
	arch/avr32/include/uapi/asm/ptrace.h:41:1: warning: this is the location of the previous definition
Prefix MSA_ to the MSA register bitmap macros, to avoid reusing the same symbol.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>