vl805: Move to old following removal of USE_FLASHROM option

Move to to the old directory now that it's no longer referenced by rpi-eeprom-update.

Add a dependency check for 'lspci' which is normally provided by
pciutils or busybox and remove the failover to the vl805 helper.

Tweak the failure messages for missing dependencies to be slightly less
OS specific.

rpi-eeprom-update

@@ -328,11 +328,15 @@ checkDependencies() {
       HAVE_VL805_EEPROM=0
    fi
 
+   if ! command -v lspci > /dev/null; then
+      die "lspci not found. Try installing the pciutils package."
+   fi
+
    # vcgencmd bootloader_version is deprecated. Use device-tree if available to
    # reduce the number of dependencies on VCHI.
    if ! [ -f "${DT_BOOTLOADER_TS}" ]; then
       if ! command -v vcgencmd > /dev/null; then
-         die "vcgencmd not found. On Debian, try installing the libraspberrypi-bin package."
+         die "vcgencmd not found. Try installing the libraspberrypi-bin package."
       fi
    fi
 
@@ -351,7 +355,7 @@ checkDependencies() {
    fi
 
    if ! command -v sha256sum > /dev/null; then
-      die "sha256sum not found. On Debian, try installing the coreutilities package"
+      die "sha256sum not found. Try installing the coreutilities package."
    fi
 
    if [ ! -f "${RECOVERY_BIN}" ]; then
@@ -557,11 +561,7 @@ getVL805CurrentVersion()
    # root then treat the version as unknown and skip VLI updates.
    VL805_CURRENT_VERSION=""
    if [ "$(id -u)" = "0" ]; then
-      if command -v lspci >/dev/null; then
          vlver="$(lspci -d 1106:3483 -xxx | awk '/^50:/ { print "VL805 FW version: " $5 $4 $3 $2 }')"
-      else
-         vlver="$(vl805 | grep "VL805 FW version")"
-      fi
       if [ -n "${vlver}" ]; then
          VL805_CURRENT_VERSION="${vlver#*: }"
       fi