nxp: imx8ulp: correct value of CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC

The core clock of 8ULP's HIFI4 DSP runs at 475.2MHz. As such,
correct the value of `CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC` to
reflect this.

Signed-off-by: Laurentiu Mihalcea <[email protected]>

Author: LaurentiuM1234

soc/nxp/imx/imx8ulp/Kconfig.defconfig

@@ -6,7 +6,7 @@ if SOC_SERIES_IMX8ULP
 if SOC_MIMX8ULP_ADSP
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC
-	default 528000000
+	default 475200000
 
 config SYS_CLOCK_TICKS_PER_SEC
 	default 50000