defconfig: msm: Create new defconfig for msmfalcon

Create new 64-bit kernel defconfig for msmfalcon to have
target specific configs enabled.
While at it, also rename 32-bit defconfig to be consistent.

Change-Id: Ic4cb890a69aa208261c6cecd2db1cfe3275d1fe9
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>