ANDROID: abi_gki_aarch64_qcom: Add clk_restore_context and clk_save_context

Export clk_restore_context and clk_save_context so that other modules can use.
There is a qcom clock driver which uses the clock restore and save context
for the hibernation use case. The PLLs, always enabled clocks are saved and
restored during this use case.

Leaf changes summary: 2 artifact changed
Changed leaf types summary: 0 leaf type changed
Removed/Changed/Added functions summary: 0 Removed, 0 Changed, 2 Added functions
Removed/Changed/Added variables summary: 0 Removed, 0 Changed, 0 Added variable

2 Added functions:

  [A] 'function void clk_restore_context()'
  [A] 'function void clk_save_context()'

Bug: 246901089
Change-Id: I0f9f0853f9593239dedb7d84941002d346038843
Signed-off-by: Taniya Das <quic_tdas@quicinc.com>