ble: ap807: improve PLL configuration sequence
ble: ap807: improve PLL configuration sequence

Update PLL configuration according to HW team guidelines.

Change-Id: I23cac4fb4a638e7416965a5399ce6947e08d0711
Signed-off-by: Alex Leibovich <8c32c4b573bb86be9076a894bc9e0dfe2b512e8a@marvell.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware