drivers: intc: vim: fix header macros

BIT_MASK(32) cannot do (1 << 32) - 1 without causing integer overflow.
Hence, for these macros BIT64_MASK(32) is required.

Additionally, remove the unnecessary (and presently unused) macros for the
register space. All of these can be reliably derived from the present
register masks.

Signed-off-by: Amneesh Singh <amneesh@ti.com>