linker: Modify linker scripts to be more generic

Make use of "IMAGE_MAX_SIZE" and "IMAGE_TEXT_BASE" rather than
CONFIG_SPL_MAX_SIZE and CONFIG_SPL_TEXT_BASE.  This lets us re-use the
same script for both SPL and TPL.  Add logic to scripts/Makefile.spl to
pass in the right value when preprocessing the script.

Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Jagan Teki <jagan@openedev.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Andreas Bießmann <andreas@biessmann.org>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Heiko Schocher <hs@denx.de>
Cc: Adam Ford <aford173@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Tested-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Tested-by: Adam Ford <aford173@gmail.com> #da850evm & omap3_logic_somlv
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
diff --git a/arch/mips/cpu/u-boot-spl.lds b/arch/mips/cpu/u-boot-spl.lds
index be194d3..d08d622 100644
--- a/arch/mips/cpu/u-boot-spl.lds
+++ b/arch/mips/cpu/u-boot-spl.lds
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 
-MEMORY { .spl_mem : ORIGIN = CONFIG_SPL_TEXT_BASE, \
-		LENGTH = CONFIG_SPL_MAX_SIZE }
+MEMORY { .spl_mem : ORIGIN = IMAGE_TEXT_BASE, \
+		LENGTH = IMAGE_MAX_SIZE }
 MEMORY { .bss_mem : ORIGIN = CONFIG_SPL_BSS_START_ADDR, \
 		LENGTH = CONFIG_SPL_BSS_MAX_SIZE }