ARM: dts: aspeed: Add LPC Snoop device

LPC snoop hardware on the ASPEED BMC, used for monitoring
host I/O port activity.

Reviewed-by: Cédric Le Goater <[e-mail]>
Signed-off-by: Joel Stanley <[e-mail]>

arch/arm/boot/dts/aspeed-g4.dtsi

···
 						status = "disabled";
 					};
 
+					lpc_snoop: lpc-snoop@0 {
+						compatible = "aspeed,ast2400-lpc-snoop";
+						reg = <0x0 0x80>;
+						interrupts = <8>;
+						status = "disabled";
+					};
+
 					lhc: lhc@20 {
 						compatible = "aspeed,ast2400-lhc";
 						reg = <0x20 0x24 0x48 0x8>;

arch/arm/boot/dts/aspeed-g5.dtsi

···
 						status = "disabled";
 					};
 
+					lpc_snoop: lpc-snoop@0 {
+						compatible = "aspeed,ast2500-lpc-snoop";
+						reg = <0x0 0x80>;
+						interrupts = <8>;
+						status = "disabled";
+					};
 
 					lhc: lhc@20 {
 						compatible = "aspeed,ast2500-lhc";