spl: binman: Split binman symbols support from enabling binman

Enabling CONFIG_BINMAN makes binman run after a build to package any
images specified in the device-tree. It also enables a mechanism for
SPL/TPL to declare and use special linker symbols that refer to other
entries in the same binman image. A similar feature that gets this info
from the device-tree exists for U-Boot proper, but it is gated behind a
CONFIG_BINMAN_FDT unlike the symbols.

Confusingly, CONFIG_SPL/TPL_BINMAN_SYMBOLS also exist. These configs
don't actually enable/disable the symbols mechanism as one would expect,
but declare some symbols for U-Boot using this mechanism.

Reuse the BINMAN_SYMBOLS configs to make them toggle the symbols
mechanism, and declare symbols for the U-Boot phases in a dependent
BINMAN_UBOOT_SYMBOLS config. Extend it to cover symbols of all phases.
Update the config prompt and help message to make it clearer about this.
Fix binman test binaries to work with CONFIG_IS_ENABLED(BINMAN_SYMBOLS).

Co-developed-by: Peng Fan <peng.fan@nxp.com>
[Alper: New config for phase symbols, update Kconfigs, commit message]
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
diff --git a/common/spl/spl.c b/common/spl/spl.c
index 7505165..5dd1226 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -52,11 +52,10 @@
 
 u32 *boot_params_ptr = NULL;
 
-#if CONFIG_IS_ENABLED(BINMAN_SYMBOLS)
+#if CONFIG_IS_ENABLED(BINMAN_UBOOT_SYMBOLS)
 /* See spl.h for information about this */
 binman_sym_declare(ulong, u_boot_any, image_pos);
 binman_sym_declare(ulong, u_boot_any, size);
-#endif
 
 #ifdef CONFIG_TPL
 binman_sym_declare(ulong, u_boot_spl, image_pos);
@@ -68,6 +67,8 @@
 binman_sym_declare(ulong, u_boot_vpl, size);
 #endif
 
+#endif /* BINMAN_UBOOT_SYMBOLS */
+
 /* Define board data structure */
 static struct bd_info bdata __attribute__ ((section(".data")));
 
@@ -152,7 +153,7 @@
 
 ulong spl_get_image_pos(void)
 {
-	if (!CONFIG_IS_ENABLED(BINMAN_SYMBOLS))
+	if (!CONFIG_IS_ENABLED(BINMAN_UBOOT_SYMBOLS))
 		return BINMAN_SYM_MISSING;
 
 #ifdef CONFIG_VPL
@@ -166,7 +167,7 @@
 
 ulong spl_get_image_size(void)
 {
-	if (!CONFIG_IS_ENABLED(BINMAN_SYMBOLS))
+	if (!CONFIG_IS_ENABLED(BINMAN_UBOOT_SYMBOLS))
 		return BINMAN_SYM_MISSING;
 
 #ifdef CONFIG_VPL