drm/msm/sde: cleanup core perf implementation

Current perf and crtc module supports multiple
real time and non-realtime client with different
API checks. These APIs are duplicated and checks
in perf modules are specific to real time vs non-
realtime. This patch cleans up the solution and
make it generalize to support the rsc type bw
client also. A crtc/encoder can now easily switch
between apps rsc vs display rsc by single rsc mode
flag to provide its bandwidth on certain client.

Change-Id: I9e2e09919949bff6e8ca1e5ae7b58449535a4c1a
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>