nyx: Add alternate power saving modes

T210:
By default max power savings is enabled.
By changing `newpowersave=` to 0, it reverts to the old behavior of smaller power savings.

This was added to mitigate some strange DRAM chips, hanging from constant frequency change of a 800 MHz - 1600 MHz back and forth.

T210B01:
Defaults to a simple loop with no power savings. That's because of untrained ram.

nyx/nyx_gui/nyx.c

@@ -280,6 +280,8 @@ void load_saved_configuration()
 						n_cfg.ums_emmc_rw = atoi(kv->val) == 1;
 					else if (!strcmp("jcdisable", kv->key))
 						n_cfg.jc_disable = atoi(kv->val) == 1;
+					else if (!strcmp("newpowersave", kv->key))
+						n_cfg.new_powersave = atoi(kv->val) == 1;
 				}
 
 				break;