ARM: dts: msm: save 2M vmemmap of memory on sun

There is 512K of DDR in a section memory and the rest is carveout in a
memory region [0x98000000 a0000000).  As section size is 128M, which
require 2M of memmap. Lose this 512K to save (2M - 512K) of memory.

CRs-Fixed: 3792207
Change-Id: I5fa1f7a366eefd464e67099ff1835dc84423d18b
Signed-off-by: Patrick Daly <quic_pdaly@quicinc.com>

qcom/sun.dtsi

@@ -3804,6 +3804,11 @@
 		reg = <0x0 0x9eb00000 0x0 0x80000>;
 	};
 
+	lost_reg_mem2 {
+		no-map;
+		reg = <0x0 0x9eb80000 0x0 0x80000>;
+	};
+
 	soccp_mem: soccp_region@9ec00000 {
 		no-map;
 		reg = <0x0 0x9ec00000 0x0 0x180000>;