image_types_verity.bbclass: remove breaking unit suffix from machine-readable verity parameters

Since cryptsetup 2.8.0 [1], "veritysetup format" prints " [bytes]"
suffixes for "Data block size" and "Hash block size" parameters:

  UUID:
  Hash type:              1
  Data blocks:            34655
  Data block size:        4096 [bytes]
  Hash blocks:            275
  Hash block size:        4096 [bytes]
  Hash algorithm:         sha256
  Salt:                   8a8d8d807bd9838a80397a13b3bc13c55780ff1677ee4489366b17dab1b29316
  Root hash:              bd85312151dc5c69efce943038e0ac4b92e14d8954cce5d3cc90513837f854bf

This output is directly converted to a shell sourcable form in
"${DEPLOY_DIR_IMAGE}/<IMAGE_LINK_NAME>.verity-params" used to
create the desired block device via "dmsetup" during runtime. The unit
suffix becomes part of the VERITY_DATA_BLOCK_SIZE and
VERITY_HASH_BLOCK_SIZE variables, breaking its consumers:

  /init: /verity-params: line 4: [bytes]: not found
  /init: /verity-params: line 6: [bytes]: not found
  verity root hash: bd85312151dc5c69efce943038e0ac4b92e14d8954cce5d3cc90513837f854bf
  [    3.323577] device-mapper: table: 253:0: verity: Invalid data device block size (-EINVAL)
  [    3.323595] device-mapper: ioctl: error adding target to table
  [    3.345301] /dev/dm-0: Can't lookup blockdev

Fix this by removing the unit suffixes from the values.

Ideally veritysetup should support machine-readable output, but that did
not spark joy on the maintainer's side [2] (at least in veritysetup
itself).

[1] commit f8788f34 ("Mark all sizes in status and dump output in the
correct units.")
[2] https://gitlab.com/cryptsetup/cryptsetup/-/issues/638

Signed-off-by: Bastian Krause <bst@pengutronix.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/classes/image_types_verity.bbclass

@@ -145,6 +145,7 @@ python do_image_verity () {
         k, v = line.split(':', 1)
         k = k.strip().upper().replace(' ', '_')
         v = v.strip()
+        v = v.removesuffix(' [bytes]')
         bb.debug(1, f"{k} {v}")
         params.append('VERITY_{}={}'.format(k, v))