UBUNTU: [Packaging] Remove old snapcraft.yaml

This file was added more than a decade ago, and is no longer working.

BugLink: https://bugs.launchpad.net/bugs/2051468
Signed-off-by: Masahiro Yamada <masahiro.yamada@canonical.com>
Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>

snapcraft.yaml

@@ -1,32 +0,0 @@
-name: pc-kernel
-version: null
-version-script: |
-    . debian/debian.env
-    dpkg-parsechangelog -l $DEBIAN/changelog -S version
-summary: The Ubuntu generic Linux kernel
-description: This Ubuntu generic Linux kernel
-grade: stable
-confinement: strict
-type: kernel
-
-parts:
-  kernel:
-    plugin: kernel
-    source: .
-    source-type: git
-    kconfigflavour: generic
-    kconfigs:
-      - CONFIG_DEBUG_INFO=n
-    kernel-with-firmware: false
-  firmware:
-    plugin: nil
-    stage-packages:
-      - linux-firmware
-    organize:
-      lib/firmware: firmware
-    prime:
-      - -usr
-      - -lib
-    build-packages:
-      - cpio
-      - libssl-dev