aspeed: Add udev mtd rules to machine recommends

These udev rules are useful outside of fw_printenv, which is how we
currently include them, so bring them in with the common machine type.

(From meta-aspeed rev: 1a7cc4767eb0393bb615ae67e4b388163aa5dc48)

Signed-off-by: Joel Stanley <joel@jms.id.au>
Change-Id: I0779fc4c2efd0e18d7729cef4548238e56c39a47
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>