config: falcon: move CFG_SYS_SPI_* to Kconfig

CFG_SYS_SPI_* are used in falcon boot to specify the offsets and size of
the respective payloads. This patch moves them to Kconfig keeping the
values consistent for each of the affected boards.

Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Anshul Dalal <anshuld@ti.com>
diff --git a/common/spl/spl_spi.c b/common/spl/spl_spi.c
index 691a431..00dbd30 100644
--- a/common/spl/spl_spi.c
+++ b/common/spl/spl_spi.c
@@ -82,13 +82,14 @@
 #if CONFIG_IS_ENABLED(OS_BOOT)
 	if (spl_start_uboot()) {
 		int err = spl_load(spl_image, bootdev, &load, 0,
-				   CFG_SYS_SPI_KERNEL_OFFS);
+				   CONFIG_SYS_SPI_KERNEL_OFFS);
 
 		if (!err)
 			/* Read device tree. */
-			return spi_flash_read(flash, CFG_SYS_SPI_ARGS_OFFS,
-					      CFG_SYS_SPI_ARGS_SIZE,
-					      (void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR);
+			return spi_flash_read(
+				flash, CONFIG_SYS_SPI_ARGS_OFFS,
+				CONFIG_SYS_SPI_ARGS_SIZE,
+				(void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR);
 	}
 #endif