rules.h: Clean up ENV_HAS_HEAP_SECTION

Commit ea2c1d3 "cpu/x86/smm: Remove heap" removed the ability to use
heap in SMM, but the ENV_HAS_HEAP_SECTION macro was not updated
appropriately.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: I5ae4a63a7bd1b27ae3e9c757aa8557f329aad0f4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79534
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <patrick@coreboot.org>
diff --git a/src/include/rules.h b/src/include/rules.h
index 7d32c77..17ef198 100644
--- a/src/include/rules.h
+++ b/src/include/rules.h
@@ -282,8 +282,8 @@
  * arch/x86/car.ld */
 #define ENV_SEPARATE_DATA_AND_BSS	(ENV_CACHE_AS_RAM && (ENV_BOOTBLOCK || !CONFIG(NO_XIP_EARLY_STAGES)))
 
-/* Currently rmodules, ramstage and smm have heap. */
-#define ENV_HAS_HEAP_SECTION	(ENV_RMODULE || ENV_RAMSTAGE || ENV_SMM)
+/* Currently rmodules and ramstage have heap. */
+#define ENV_HAS_HEAP_SECTION	(ENV_RMODULE || ENV_RAMSTAGE)
 
 /* Set USER_SPACE in the makefile for the rare code that runs in userspace */
 #if defined(__USER_SPACE__)