Convert CONFIG_SYS_FLASH_ERASE_TOUT et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_FLASH_ERASE_TOUT
   CONFIG_SYS_FLASH_LOCK_TOUT
   CONFIG_SYS_FLASH_UNLOCK_TOUT
   CONFIG_SYS_FLASH_WRITE_TOUT

In practice, for two m68k platforms we move to hard-coding with a
comment the timeout values, rather than try and make convoluted Kconfig
logic.  We add options for the write and erase options to the pic32
flash driver, as this driver does make use of them.  Everywhere else
these are unreferenced values.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 985cc01..e28ff04 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -157,6 +157,18 @@
 	  This enables access to Microchip PIC32 internal non-CFI flash
 	  chips through PIC32 Non-Volatile-Memory Controller.
 
+config SYS_FLASH_ERASE_TOUT
+	int "Timeout in ms for performing an erase operation on the flash"
+	depends on FLASH_PIC32
+	help
+	  Timeout for Flash erase operations (in ms)
+
+config SYS_FLASH_WRITE_TOUT
+	int "Timeout in ms for performing a write operation on the flash"
+	depends on FLASH_PIC32
+	help
+	  Timeout for Flash write operations (in ms)
+
 config RENESAS_RPC_HF
 	bool "Renesas RCar Gen3 RPC HyperFlash driver"
 	depends on RCAR_GEN3 && DM_MTD