treewide: unify the linker symbol reference format

Now all linker symbols are declared as type char[]. Though we can
reference the address via both the array name 'var' and its address
'&var'. It's better to unify them to avoid confusing developers.
This patch converts all '&var' linker symbol refrences to the most
commonly used format 'var'.

Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/board_r.c b/common/board_r.c
index 4aaa894..598155c 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -126,9 +126,9 @@
 #ifdef __ARM__
 	monitor_flash_len = _end - __image_copy_start;
 #elif defined(CONFIG_RISCV)
-	monitor_flash_len = (ulong)&_end - (ulong)&_start;
+	monitor_flash_len = (ulong)_end - (ulong)_start;
 #elif !defined(CONFIG_SANDBOX) && !defined(CONFIG_NIOS2)
-	monitor_flash_len = (ulong)&__init_end - gd->relocaddr;
+	monitor_flash_len = (ulong)__init_end - gd->relocaddr;
 #endif
 #if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 	/*