arm: mvebu: Define env_sf_get_env_addr() also for Proper U-Boot

Proper U-Boot moves SPI0 CS0 Flash mapping from 0xD4000000 to 0xF4000000
and change its size from 64 MB to 8 MB. Definitions are already in
MBUS_SPI_BASE/MBUS_SPI_SIZE macros. So define these macros also for SPL
build, use them in env_sf_get_env_addr() function and move this function
from spl.c to cpu.c to be available in Proper U-Boot too.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c
index 6fbbfcf..bbe167e 100644
--- a/arch/arm/mach-mvebu/cpu.c
+++ b/arch/arm/mach-mvebu/cpu.c
@@ -35,6 +35,15 @@
 #endif
 };
 
+/* SPI0 CS0 Flash of size MBUS_SPI_SIZE is mapped to address MBUS_SPI_BASE */
+#if CONFIG_ENV_SPI_BUS == 0 && CONFIG_ENV_SPI_CS == 0 && \
+    CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE <= MBUS_SPI_SIZE
+void *env_sf_get_env_addr(void)
+{
+	return (void *)MBUS_SPI_BASE + CONFIG_ENV_OFFSET;
+}
+#endif
+
 void lowlevel_init(void)
 {
 	/*