ldrp_v2: Support active cpus verification only for 64-bit platforms

Minimum number of required active cpu in a cluster is mostly helpful
in 64-bit platforms, compared to 32-bit.

And 32-bit platform code has different arch topology support, instead of
mucking around the 32/64-bit support, skip active cpu verification for
32-bit, as they are mostly single cluster platforms.

Change-Id: Idade91d08534590c6e4597b918557ffb1131505d
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>