clk: qcom: alpha-pll: Export required symbols from alpla-pll

Export symbols clk_trion_pll_configure() and clk_regera_pll_configure()
so drivers as modules can use it.

Change-Id: I498b309e48b87aaab92c2395b265f1938ddb567f
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>