vc/google/chromeos/acpi: Replace Store(a,b) with ASL 2.0 syntax

Replace `Store (a, b)` with `b = a`.

Change-Id: I8b2d97063ba199274c1072ba3a12613162a17ef1
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70630
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/vendorcode/google/chromeos/acpi/ramoops.asl

@@ -17,8 +17,8 @@ Scope (\_SB)
 		{
 			CreateDwordField (^RBUF, ^MRES._BAS, RBAS)
 			CreateDwordField (^RBUF, ^MRES._LEN, RLEN)
-			Store (\RMOB, RBAS)
-			Store (\RMOL, RLEN)
+			RBAS = \RMOB
+			RLEN = \RMOL
 			Return (^RBUF)
 		}
 		Method(_STA, 0)