fix(boot-qrb2210): correct load address comment

Update the comment for auxiliary load addresses to indicate that
they must remain above 0x8a800000, where boot.scr is sourced from.

Signed-off-by: Govind Singh <govind.sk85@gmail.com>

Author: govindsi

config/bootscripts/boot-qrb2210.cmd

@@ -9,7 +9,7 @@
 setenv kernel_addr_r "0x42000000"
 setenv fdt_addr_r "0x48000000"
 setenv ramdisk_addr_r "0x82000000"
-# Aux loads (env, dtbos). Keep below 0x8a800000 where boot.scr is sourced from.
+# Aux loads (env, dtbos). Keep above 0x8a800000 where boot.scr is sourced from.
 setenv load_addr "0x90000000"
 setenv overlay_error "false"