Support for different IMX8MQ LPDDR4 configurations 1. Auto-detect DDR boot frequency and backup DRAM PLL cfg 2. Save/restore all necessary DDRC/DDRPHY register to adapt to all LPDDR4 configurations Change-Id: I2d63fe9928e826a7d0072bd378621c38b12a2336 Signed-off-by: Michael Brooks <michaelbrooks@google.com>