ARM: dts: msm: Add DTSI entry to handle PA conf

- Add base address of RPMH_PDC_WLAN_RF_TCSn_CMDn_DATA
register and assign reg-name in order to access them
in BT power driver.
- Assign RPMH_PDC_WLAN_RF_TCS6_CMD2_DATA
offset from base address.

Change-Id: If58904a8c93fc60bcc9589ce40004dba924d9bb7