trusty: keymint: trusty-keymint-apex.mk: fix condition

Bug: 392489757
Test: launch_cvd --secure_hals=guest_keymint_trusty_insecure
Change-Id: Icb3210012d04b13eec54858d3304c64eb9a0c4a8
diff --git a/trusty/keymint/trusty-keymint-apex.mk b/trusty/keymint/trusty-keymint-apex.mk
index 8b7f4d0..7c44fbc 100644
--- a/trusty/keymint/trusty-keymint-apex.mk
+++ b/trusty/keymint/trusty-keymint-apex.mk
@@ -22,7 +22,7 @@
     android.hardware.security.keymint-service.trusty_tee.cpp \
     android.hardware.security.keymint-service.trusty_tee \
 
-ifeq ($(findstring $(TRUSTY_SYSTEM_VM),enabled),enabled)
+ifeq ($(findstring enabled, $(TRUSTY_SYSTEM_VM)),enabled)
     PRODUCT_PACKAGES += \
         android.hardware.security.keymint-service.trusty_system_vm \