soc/amd/stoneyridge/acpi/sleepstates.asl: Fix guarded code

Remove #if statement and replace it with if(IS_ENABLED(...)) per coreboot
recommendations.

BUG=b:62200858
TEST=Build kahlee.

Change-Id: I268b228706a625e1415c4f24e808261c279ba41e
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/23575
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/amd/stoneyridge/acpi/sleepstates.asl

@@ -15,11 +15,10 @@
  */
 
 /* S1 support: bit 0, S2 Support: bit 1, etc. S0 & S5 assumed */
-#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
-Name (SSFG, 0x0D)
-#else
 Name(SSFG, 0x09)
-#endif
+If (IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)) {
+	Store(0x0D, SSFG)
+}
 
 /* Supported sleep states: */
 Name(\_S0, Package () {0x00, 0x00, 0x00, 0x00} )	/* (S0) - working state */