refactor(st-clock): move stm32mp1_clk_rcc_regs_*lock

Those functions are only used on MP1, they should not be in STM32 clock
core. Move them to MP13 driver (they are already in MP15 driver).
Redefine new clk_stm32_rcc_regs_*lock() functions in clock core. This
change avoid sparse warning:
drivers/st/clk/clk-stm32-core.c:46:6: warning: symbol
 'stm32mp1_clk_rcc_regs_lock' was not declared. Should it be static?
drivers/st/clk/clk-stm32-core.c:51:6: warning: symbol
 'stm32mp1_clk_rcc_regs_unlock' was not declared. Should it be static?

Change-Id: I9f255acaa843e41fc14267c1a8091f93bd029796
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
diff --git a/drivers/st/clk/clk-stm32mp13.c b/drivers/st/clk/clk-stm32mp13.c
index 6a6ee5d..1cacad0 100644
--- a/drivers/st/clk/clk-stm32mp13.c
+++ b/drivers/st/clk/clk-stm32mp13.c
@@ -2332,6 +2332,16 @@
 	return 0;
 }
 
+void stm32mp1_clk_rcc_regs_lock(void)
+{
+	clk_stm32_rcc_regs_lock();
+}
+
+void stm32mp1_clk_rcc_regs_unlock(void)
+{
+	clk_stm32_rcc_regs_unlock();
+}
+
 int stm32mp1_clk_init(void)
 {
 	int ret;