[FS#3887] MTD partition offset not correctly mapped when bad eraseblocks present

[OpenWrt Bugs]

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FS#3887 - MTD partition offset not correctly mapped when bad eraseblocks present
User who did this - csharper2005 (csharper2005)

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1. Another NAND devices are are also affected by the issue. For example, [[https://forum.openwrt.org/t/fixed-position-partition-splitting-and-bad-blocks-on-nand-flash/94305/|ZyXEL NR7101]]. 
2. Affected software versions. 21.02 branch is also affected:
[   14.116745] mt7621-nand 1e003000.nand: Using programmed access timing: 31c07388
[   14.131565] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xf1
[   14.144220] nand: Macronix MX30LF1G18AC
[   14.151841] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[   14.166910] mt7621-nand 1e003000.nand: ECC strength adjusted to 4 bits
[   14.179933] mt7621-nand 1e003000.nand: Using programmed access timing: 21005134
[   14.194485] mt7621-nand 1e003000.nand: Using programmed access timing: 21005134
[   14.209046] Scanning device for bad blocks
[   14.245594] Bad eraseblock 22 at 0x0000002c0000
[   15.517155] 8 fixed-partitions partitions found on MTD device mt7621-nand
[   15.530664] Creating 8 MTD partitions on "mt7621-nand":
[   15.541071] 0x000000000000-0x000000100000 : "u-boot"
[   15.552186] 0x000000100000-0x000000200000 : "dynamic partition map"
[   15.565827] 0x000000200000-0x000000300000 : "Factory"
[   15.576979] 0x000000300000-0x000000400000 : "Boot Flag"
[   15.588499] 0x000000400000-0x000000a00000 : "kernel"
[   15.599511] 0x000000a00000-0x000001000000 : "Kernel 2"
[   15.610909] 0x000001000000-0x000007c00000 : "ubi"
[   15.622086] 0x000007c00000-0x000007f80000 : "bad block reserved"

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3887#comment9843

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