soc/add_spi_flash: Revert PHY_FREQUENCY definition and use in BIOS.

litex/soc/integration/soc.py

@@ -1955,6 +1955,7 @@ class LiteXSoC(SoC):
         self.bus.add_slave(name=name, slave=spiflash_core.bus, region=spiflash_region)
 
         # Constants.
+        self.add_constant(f"{name}_PHY_FREQUENCY",     clk_freq)
         self.add_constant(f"{name}_MODULE_NAME",       module.name)
         self.add_constant(f"{name}_MODULE_TOTAL_SIZE", module.total_size)
         self.add_constant(f"{name}_MODULE_PAGE_SIZE",  module.page_size)

litex/soc/software/liblitespi/spiflash.c

@@ -57,7 +57,7 @@ int spiflash_freq_init(void)
 
 #else
 
-	printf("SPI Flash clk configured to %ld MHz\n", CONFIG_CLOCK_FREQUENCY/1000000);
+	printf("SPI Flash clk configured to %ld MHz\n", SPIFLASH_PHY_FREQUENCY/1000000);
 
 #endif