profiles: extract secure eMMC boot config into shared profile
Create profiles/secure_boot_emmc.yml as a common base for secure eMMC
boot with swupdate A/B partitioning, consolidating duplicated config
from mxl_x86_osp_tb341_v2 and qca_ipq95xx.
Moved to secure_boot_emmc.yml:
- Packages: swupdate, libubootenv, imagegenerator,
initramfs-generator, readmfg, libfdt, fdt-utils, kmod-sysregister
- Diffconfig: secure initramfs, swupdate handlers
(ext4/diskpart/diskformat), imagegenerator, MFG global signature,
kernel keyring, sysregister bootcount
Also remove unused packages from shared profiles:
- prpl_core: drop keyctl, keyutils, kmod-sysregister
- prpl: drop lvm2
Closes: PCF-2097
Fixes: PCF-1875, PCF-1878
Tracked-by: FEAT-29
Signed-off-by: Mohamed-nour Toumi <mohamed.toumi_ext@softathome.com>