sc7180: clock: Define the UART frequency for QUPV3

The frequency to be used by UART client is 7.3728MHz, thus define it in
the clock header to be used by the driver.

Tested: UART frequency request by client driver.

Change-Id: I1ced350fe9826ea05b03ffc11aced2c21fe85c9e
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40329
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/qualcomm/sc7180/clock.c

@@ -22,7 +22,7 @@
 
 struct clock_config qup_cfg[] = {
 	{
-		.hz = 7372800,
+		.hz = QUPV3_UART_SRC_HZ,
 		.src = SRC_GPLL0_EVEN_300MHZ,
 		.div = DIV(1),
 		.m = 384,

src/soc/qualcomm/sc7180/include/soc/clock.h

@@ -32,6 +32,7 @@
 #define SRC_XO_HZ			(19200 * KHz)
 #define GPLL0_EVEN_HZ			(300 * MHz)
 #define GPLL0_MAIN_HZ			(600 * MHz)
+#define QUPV3_UART_SRC_HZ		7372800
 
 #define SRC_XO_19_2MHZ			0
 #define SRC_GPLL0_MAIN_600MHZ		1