pwm: pwm-qti-lpg: Add support for LUT pattern control through SDAM

In some PMICs, the LUT patterns and the LPG ramp configurations can be
stored in the shared direct access memory (SDAM) module instead of LUT
peripheral. Add support for configuring and using LUT pattern from SDAM.

Change-Id: I24b8b13c0c3109d7acab5e00c0fbc30438076a76
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>