ipq807x: added support for HK10 external reference clk select.

By default UNIPHY PLL takes 48MHz, now this need to take  50M
from external oscilator input pin for HK10. So need to change
the PLL ref sel.

Affected only for HK10. Tested on Reworked HK01 board with 50MHz
oscillator connected to USGMII_OSCILL_50M pin

Change-Id: Ie90fdbbfbfc700a30d9ada895baa1a170db25888
Signed-off-by: Tushar Nimkar <tnimkar@codeaurora.org>
3 files changed