Removing --subject-prefix='meta-freescale][PATCH']' from git
format-patch the generated patch will be created with default
subject as shown bellow:

Subject: [PATCH] README: Remove subject-prefix from git format-patch command

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>