soc/qualcomm/x1p42100: Add placeholder for early clock initialization

This commit adds the `clock_init()` function for the Qualcomm x1p42100
SoC. This function is now called at the beginning of
`bootblock_soc_init()` to enable SoC-specific clock setup early in the
boot process.

The `clock_init()` function definition is currently a placeholder
and will be populated with the required clock configurations in
subsequent changes.

BUG=b:404985109
TEST=Able to build google/bluey

Change-Id: Ifb856ea4132def9cd3a36b081d24037a1a4efaba
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87850
Reviewed-by: Pranava Y N <pranavayn@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/qualcomm/x1p42100/bootblock.c

@@ -9,6 +9,7 @@
 
 void bootblock_soc_init(void)
 {
+	clock_init();
 	if (!CONFIG(COMPRESS_BOOTBLOCK))
 		soc_mmu_init();
 

src/soc/qualcomm/x1p42100/clock.c

@@ -16,3 +16,8 @@ void clock_configure_dfsr(int qup)
 {
 	/* placeholder */
 }
+
+void clock_init(void)
+{
+	/* placeholder */
+}

src/soc/qualcomm/x1p42100/include/soc/clock.h

@@ -37,6 +37,7 @@ enum clk_qup {
 };
 
 /* TODO: update as per datasheet */
+void clock_init(void);
 void clock_configure_qspi(uint32_t hz);
 void clock_enable_qup(int qup);
 void clock_configure_dfsr(int qup);