trusty: keymint: Bump to IRPC v3

Bug: 260920864
Test: atest VtsHalRemotelyProvisionedComponentTargetTest
Test: atest RemoteProvisionerUnitTests
Change-Id: I51f58e5e768c0687ad97e5cd7a4c478657d54e48
diff --git a/rules.mk b/rules.mk
index 8960611..e8df11e 100644
--- a/rules.mk
+++ b/rules.mk
@@ -165,9 +165,7 @@
 
 endif
 
-# TODO(b/235265072): Move to RKP v3 once the whole stack is ready.
-# For now, remain on v2 for backwards-compatibility.
-TRUSTY_KM_RKP_VERSION ?= 2
+TRUSTY_KM_RKP_VERSION ?= 3
 ifdef TRUSTY_KM_RKP_VERSION
     MODULE_COMPILEFLAGS += -DTRUSTY_KM_RKP_VERSION=$(TRUSTY_KM_RKP_VERSION)
 endif