MSM sound, graphics, and camera drivers all depend on PMEM being
enabled. If pmem is disabled, these drivers should not be
included.

Also fix some warnings:

drivers/video/msm/mdp_ppp.c:1141: warning: unused variable 'vstart'
drivers/video/msm/mdp_ppp.c:501: warning: 'get_len' defined but not used

Acked-by: Stephen Boyd <sboyd@quicinc.com>
Signed-off-by: Michael Bohan <mbohan@quicinc.com>
Signed-off-by: Shylender Gaddamwar <c_shylen@quicinc.com>