sa53: adjust GNSS UART timeout value

Every time the UART timeout happens it takes minimum 3 seconds to
recover the communication. That's why previously configured value did
help to avoid going to HOLDOVER. Adjust the value to go to holdover
after 3 consecutve timeouts.

Signed-off-by: Vadim Fedorenko <vadfed@meta.com>

src/oscillators/sa5x_oscillator.c

@@ -19,7 +19,7 @@
 #define MAX_SERIALNUM_LENGTH 11
 #define DIGITAL_TUNING_MAX 20000000LL
 #define DEFAULT_PHASELIMIT 100000 // Phase limit is 100us
-#define NO_GNSS_FIX_TIMEOUT 3 // seconds after last gnss Fix befor holdover
+#define NO_GNSS_FIX_TIMEOUT 9 // seconds after last gnss Fix befor holdover
 #define BIT(nr)			(1UL << (nr))
 
 #define ATTR_FW_SERIAL    		BIT(0)