boot: zephyr: Remove references to tinycrypt

These are not needed

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

Author: nordicjm

boot/zephyr/prj.conf

@@ -11,12 +11,6 @@ CONFIG_BOOT_BOOTSTRAP=n
 ### mbedTLS has its own heap
 # CONFIG_HEAP_MEM_POOL_SIZE is not set
 
-### We never want Zephyr's copy of tinycrypt.  If tinycrypt is needed,
-### MCUboot has its own copy in tree.
-# CONFIG_TINYCRYPT is not set
-# CONFIG_TINYCRYPT_ECC_DSA is not set
-# CONFIG_TINYCRYPT_SHA256 is not set
-
 CONFIG_FLASH=y
 
 ### Various Zephyr boards enable features that we don't want.