local.conf template: Remove DEPLOY_DIR_IMAGE

DEPLOY_DIR_IMAGE already defaults to "${DEPLOY_DIR}/images/${MACHINE}"
in recent oe-core versions, so remove the directive.
u-boot-zynq-spl: Simplify recipe

Use variables to instruct the standard u-boot.inc what to do instead
of appending the install/deploy tasks.
linux-topic: Restore QSPI flash support for the Miami

Somehow the QSPI NOR flash driver got lost, enable it again in defconfig.
Upgrade the kernel to get the quad-read fixes for the m25p80 driver, so
the QSPI now operates as before.
Re-import the patch for disabling 4k sector use to speed up erasing.
Update kernel configuration for the Vice board.