lib: Mark crc8 as relocation code

Mark the crc8 code as needed by relocation. This is used as a simple
check against corruption of the code when copying.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/crc8.c b/lib/crc8.c
index 811e199..bbb229c 100644
--- a/lib/crc8.c
+++ b/lib/crc8.c
@@ -6,11 +6,12 @@
 #ifdef USE_HOSTCC
 #include <arpa/inet.h>
 #endif
+#include <asm/sections.h>
 #include <u-boot/crc.h>
 
 #define POLY	(0x1070U << 3)
 
-static unsigned char _crc8(unsigned short data)
+__rcode static unsigned char _crc8(unsigned short data)
 {
 	int i;
 
@@ -23,7 +24,7 @@
 	return (unsigned char)(data >> 8);
 }
 
-unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
+__rcode unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
 {
 	int i;