chore: Remove unused patches + Remove grub-efi-precompiled for GRUB v2.04

[lluiscampos]

No description provided.

[mender-test-bot]

Merging these commits will result in the following changelog entries:

Changelogs

meta-mender (remove-old-grub-and-cleanup)

New changes in meta-mender since master:

• Remove recipe for grub-efi-precompiled for GRUB v2.04

[mender-test-bot]

@lluiscampos, Let me know if you want to start the integration pipeline by mentioning me and the command "start pipeline".

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my commands and options

You can trigger a pipeline on multiple prs with:

• mentioning me and start pipeline --pr mender/127 --pr mender-connect/255

You can start a fast pipeline, disabling full integration tests with:

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 cherry-pick to:
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[lluiscampos]

@mender-test-bot start pipeline

[mender-test-bot]

Hello 😺 I created a pipeline for you here: Pipeline-1614527636

Build Configuration Matrix

Key	Value
BUILD_BEAGLEBONEBLACK	true
BUILD_CLIENT	true
BUILD_QEMUX86_64_BIOS_GRUB	true
BUILD_QEMUX86_64_BIOS_GRUB_GPT	true
BUILD_QEMUX86_64_UEFI_GRUB	true
BUILD_VEXPRESS_QEMU	true
BUILD_VEXPRESS_QEMU_FLASH	true
BUILD_VEXPRESS_QEMU_UBOOT_UEFI_GRUB	true
META_MENDER_REV	pull/2238/head
RUN_INTEGRATION_TESTS	true
TEST_QEMUX86_64_BIOS_GRUB	true
TEST_QEMUX86_64_BIOS_GRUB_GPT	true
TEST_QEMUX86_64_UEFI_GRUB	true
TEST_VEXPRESS_QEMU	true
TEST_VEXPRESS_QEMU_FLASH	true
TEST_VEXPRESS_QEMU_UBOOT_UEFI_GRUB	true

[mender-test-bot]

Hello 😺 This PR contains changelog entries. Please, verify the need of backporting it to the following release branches:
scarthgap (release 3.8.x) - 🤖 🍒
kirkstone (release 3.7.x)