mtd: rawnand: gpmi: support fast edo timings for mx28

In the i.MX28 manual (MCIMX28RM, Rev. 1, 2010) you can find an example
(15.2.4 High-Speed NAND Timing) of how to configure the GPMI controller
to manage High-Speed ​​NAND devices, so it was wrong to assume that only
i.MX6 can achieve EDO timings.

This patch has been tested on a 2048/64 byte NAND (Micron MT29F2G08ABAEAH4).
Kernel mtd tests:
 - mtd_nandbiterrs
 - mtd_nandecctest
 - mtd_oobtest
 - mtd_pagetest
 - mtd_readtest
 - mtd_speedtest
 - mtd_stresstest
 - mtd_subpagetest
 - mtd_torturetest [cycles_count = 10000000]
run without errors.

Before this patch (mode 0):
---------------------------
eraseblock write speed is 2098 KiB/s
eraseblock read speed is 2680 KiB/s
page write speed is 1689 KiB/s
page read speed is 2522 KiB/s
2 page write speed is 1899 KiB/s
2 page read speed is 2579 KiB/s
erase speed is 128000 KiB/s
2x multi-block erase speed is 73142 KiB/s
4x multi-block erase speed is 204800 KiB/s
8x multi-block erase speed is 256000 KiB/s
16x multi-block erase speed is 256000 KiB/s
32x multi-block erase speed is 256000 KiB/s
64x multi-block erase speed is 256000 KiB/s

After this patch (mode 5):
-------------------------
eraseblock write speed is 3390 KiB/s
eraseblock read speed is 5688 KiB/s
page write speed is 2680 KiB/s
page read speed is 4876 KiB/s
2 page write speed is 2909 KiB/s
2 page read speed is 5224 KiB/s
erase speed is 170666 KiB/s
2x multi-block erase speed is 204800 KiB/s
4x multi-block erase speed is 256000 KiB/s
8x multi-block erase speed is 256000 KiB/s
16x multi-block erase speed is 256000 KiB/s
32x multi-block erase speed is 256000 KiB/s
64x multi-block erase speed is 256000 KiB/s

Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220118095434.35081-5-dario.binacchi@amarulasolutions.com

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