arm: mach-msm: qdsp6v2: update dual mono setting check

AUDIO_AAC_DUAL_MONO_PL_PR is 0 anyway and dual mono
setting is defined as unsigned value. Hence,
there is no need if new setting is less than
AUDIO_AAC_DUAL_MONO_PL_PR.

Change-Id: I2e18a875e211d05d100d827fcd5b67545de168ac
Signed-off-by: Patrick Lai <plai@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/qdsp6v2/audio_aac.c
	arch/arm/mach-msm/qdsp6v2/audio_multi_aac.c