Lower load_addr for boards with only 1GB RAM

Setting load_addr to "0x44000000" (1088 MiB) is too high for boards with only 1GB of RAM, and causes boot failure. I tried some lower values, until I found "0x34000000" (832 MiB) to work. I made quite big steps, so we probably could find something slightly higher to work too, but I see no reason why we would need to do it.

Reference: https://forum.armbian.com/topic/8829-le-potato-c2-k2-419-lts-testing-thread/?do=findComment&comment=69850

config/bootscripts/boot-meson64.cmd

@@ -2,7 +2,7 @@
 #
 # Please edit /boot/armbianEnv.txt to set supported parameters
 #
-setenv load_addr "0x44000000"
+setenv load_addr "0x34000000"
 setenv initrd_high "0xffffffff"
 setenv fdt_high "0xffffffff"
 setenv overlay_error "false"