msm_serial_hs: Add runtime support for determining UARTDM register offsets

Currently, HSUART uses a Kconfig option to determine the UARTDM core
version register offsets during compile time. This change adds runtime
configuration support for determining the version of the UARTDM core,
and use the same with appropriate register mappings in HSUART driver.

Also with addition of runtime support for determining the UARTDM core
version register offsets, Kconfig CONFIG_MSM_UARTDM_Core_v14 is no longer
required. This change also does clean up of defconfig files for removing
the config and uart register header files for achieving the same.

CRs-Fixed: 459281
Change-Id: Iff4ad1c37a3b04345d68cbe0a8befa284b49a539
Signed-off-by: Saket Saurabh <ssaurabh@codeaurora.org>
4 files changed