v2.1: CM PHC driver alignment for pcm4l 4.3.0 and move FW loading to MFD routine

Minor CM PHC fixes
Centralized FW loading functions into MFD

v2.0: MFD/MISC support for synced 2.0.0

• Support for https://github.com/renesas/synced/releases/tag/v2.0.0.
• CM PHC driver bug fixes

v1.2

Fix:
[STEELAI-771] cm: Return EPROBE_DEFER if load firmware fails with ENOENT
[STEELAI-767] Fix - use 'max_adj' value in phase pull-in's max_ffo_ppb instead of 0

v1.1

Fix:
[STEELBD-6755] Apply write-frequency regardless of current_freq_scaled_ppm to switch the PLL mode

New:
[STEELAI-732] Introduce rsmu_ctl tool to exercise rsmu_cdev