ANDROID: GKI: clk: Add support for voltage voting

This change adds support for voltage voting in the clock framework. This
will NOT be carried over to newer kernels.

Bug: 150506629
Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: David Dai <daidavid1@codeaurora.org>
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>
Signed-off-by: Shefali Jain <shefjain@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
[saravanak: Squashed the following commits and dropped some debug code
	    and code whose functionality that's replaced by clk_sync_state()
	ff5ce501ba80 clk: do not vote for vdd_class level with 0 Hz rate_max
	96f0596cc03a clk: provider: cleanup of unused use_max_uV
	83d12e55ba9d clk: Always vote INT_MAX as maximum voltage for a rail
	352850e65775 clk: handle reentrant clk_set_rate() calls from clock supply regulators
	0d8060cd6b63 clk: add bus voting to rate_get, rate_set, enable_set debug functions
	d4c36a3d1038 clk: remove prepare lock and bus voting in clk_debug_print_hw
	813f66628115 clk: add bus voting ops for debug purposes
	7e0561072d82 clk: qcom: Fix return value check for round rate during clock registration
	c4540b8ee30c clk: fix conflicting bit for measure clock flag
	fa9b30447f77 clk: correct vdd_class voting scheme used during clock rate changes
	61dad2894f52 clk: Move VDD voltage voting from core clock to top clock
	0cbef8b6fc58 clk: qcom: Add support to log PLL/RCGR values in case of failure
	bcc43f7a193b clk: qcom: Add support for debugfs measure clock
	1ac9516f7402 clk: Export the clock driver's voltage voting APIs
	c4316254d2f9 clk: add/modify debugfs support for clocks
	d30b895f2155 clk: move check for CLK_ENABLE_HAND_OFF at unused tree
	11032174cac0 clk: Add support to provide OPP tables for clocks
	f349485712d2 clk: Add support to vote to regulator framework from clk framework
	81286aed669c clk: Check for failure at clk_change_rate
	6a4951a8308c clk: qcom: clk-voter: Add support for voter clocks
	b904878a04fb clk: Add support to set custom flags with clk_set_flags ]
Signed-off-by: Saravana Kannan <saravanak@google.com>
Change-Id: I95574f11053e8f3762c8d660183ce5004ff5cc5b