dynamic parts should use inherit_defer

[priv-kweihmann]

A new feature is coming to bitbake soon called inherit_defer, which basically allows inherit statements like

FOO ?= "bar"
inherit ${FOO}

to override the value of FOO from a bbappend.

The linter should suggest the following

• if an inline code block or a variable is used as part of an inherit statement inherit_defer should be used
• if inherit_defer doesn't use any inline code or variable inherit should be suggested