feat(handoff): add Mbed-TLS heap info entry tag

Update library to support XFERLIST_MBEDTLS_HEAP_INFO (tag = 0x105).
This is an Arm-specific TE type that enables the location and size
of the stack-based memory region used by Mbed-TLS as a heap to be
passed via a transfer list.

[1] https://firmwarehandoff.github.io/firmware_handoff/main/transfer_list.html#mbed-tls-heap-information-xferlist-mbedtls-heap-info

Change-Id: I1d27b6b2d5a13101b7680b8a19e833354655cd30
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/include/lib/transfer_list.h b/include/lib/transfer_list.h
index 047b2d0..7a38e70 100644
--- a/include/lib/transfer_list.h
+++ b/include/lib/transfer_list.h
@@ -61,6 +61,7 @@
 	TL_TAG_EXEC_EP_INFO64 = 0x102,
 	TL_TAG_TB_FW_CONFIG = 0x103,
 	TL_TAG_SRAM_LAYOUT64 = 0x104,
+	TL_TAG_MBEDTLS_HEAP_INFO = 0x105,
 };
 
 enum transfer_list_ops {