tools: relocate-rela: Use global variables

Declare rela_start/end and text_base as global variables. It will help with
using these variables for ELF decoding.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/7485b163e92f8f3f754c35f7c88c3314f2212efd.1655299267.git.michal.simek@amd.com
diff --git a/tools/relocate-rela.c b/tools/relocate-rela.c
index 8839871..67a138a 100644
--- a/tools/relocate-rela.c
+++ b/tools/relocate-rela.c
@@ -20,6 +20,8 @@
 #define R_AARCH64_RELATIVE	1027
 #endif
 
+static uint64_t rela_start, rela_end, text_base;
+
 static const bool debug_en;
 
 static void debug(const char *fmt, ...)
@@ -63,7 +65,7 @@
 {
 	FILE *f;
 	int i, num;
-	uint64_t rela_start, rela_end, text_base, file_size;
+	uint64_t file_size;
 
 	if (argc != 5) {
 		fprintf(stderr, "Statically apply ELF rela relocations\n");