flash/nor: consolidate flash protect/protect_check

Make flash_driver methods protect() and protect_check()
optional.

Remove dummy definitions of these methods from the drivers
which do not implement protection handling.

Some drivers did not define protect method. It raised segfault
before this change and now it is handled properly.

Lot of drivers returned ERROR_OK from dummy protect()
- now flash_driver_protect() returns an error if not handled by the driver.

Change-Id: I2d4a0da316bf03c6379791b1b1c6198fbf22e66c
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/4765
Tested-by: jenkins
Reviewed-by: Andreas Bolsch <hyphen0break@gmail.com>
Reviewed-by: Christopher Head <chead@zaber.com>

src/flash/nor/aduc702x.c

@@ -74,12 +74,6 @@ static int aduc702x_build_sector_list(struct flash_bank *bank)
 	return ERROR_OK;
 }
 
-static int aduc702x_protect_check(struct flash_bank *bank)
-{
-	printf("aduc702x_protect_check not implemented yet.\n");
-	return ERROR_OK;
-}
-
 static int aduc702x_erase(struct flash_bank *bank, int first, int last)
 {
 	/* int res; */
@@ -130,12 +124,6 @@ static int aduc702x_erase(struct flash_bank *bank, int first, int last)
 	return ERROR_OK;
 }
 
-static int aduc702x_protect(struct flash_bank *bank, int set, int first, int last)
-{
-	printf("aduc702x_protect not implemented yet.\n");
-	return ERROR_FLASH_OPERATION_FAILED;
-}
-
 /* If this fn returns ERROR_TARGET_RESOURCE_NOT_AVAILABLE, then the caller can fall
  * back to another mechanism that does not require onboard RAM
  *
@@ -394,11 +382,9 @@ struct flash_driver aduc702x_flash = {
 	.name = "aduc702x",
 	.flash_bank_command = aduc702x_flash_bank_command,
 	.erase = aduc702x_erase,
-	.protect = aduc702x_protect,
 	.write = aduc702x_write,
 	.read = default_flash_read,
 	.probe = aduc702x_probe,
 	.auto_probe = aduc702x_probe,
 	.erase_check = default_flash_blank_check,
-	.protect_check = aduc702x_protect_check,
 };