unit-test: add disk and gpt unit testing

Author: rizlik

tools/unit-tests/Makefile

@@ -29,7 +29,7 @@ TESTS:=unit-parser unit-extflash unit-string unit-spi-flash unit-aes128 \
        unit-aes256 unit-chacha20 unit-pci unit-mock-state unit-sectorflags \
        unit-image unit-nvm unit-nvm-flagshome unit-enc-nvm \
        unit-enc-nvm-flagshome unit-delta unit-update-flash \
-       unit-update-flash-enc unit-update-ram unit-pkcs11_store
+       unit-update-flash-enc unit-update-ram unit-pkcs11_store unit-disk
 
 all: $(TESTS)