powerpc: 74xx_7xx: remove 74xx_7xx cpu support

All the 74xx_7xx boards are still non-generic boards:
P3G4, ZUMA, ppmc7xx, ELPPC, mpc7448hpc2

Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Stefan Roese <sr@denx.de>
Acked-by: York Sun <yorksun@freescale.com>
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Nye Liu <nyet@zumanetworks.com>
Cc: Roy Zang <tie-fei.zang@freescale.com>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index e1a81d3..b79c5a4 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -12,6 +12,11 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+P3G4             powerpc     74xx_7xx       -           -           Wolfgang Denk <wd@denx.de>
+ZUMA             powerpc     74xx_7xx       -           -           Nye Liu <nyet@zumanetworks.com>
+ppmc7xx          powerpc     74xx_7xx       -           -
+ELPPC            powerpc     74xx_7xx       -           -
+mpc7448hpc2      powerpc     74xx_7xx       -           -           Roy Zang <tie-fei.zang@freescale.com>
 CPCI405          ppc4xx      405gp          5f1459dc    2015-01-13  Matthias Fuchs <matthias.fuchs@esd.eu>
 CPCI405DT        ppc4xx      405gpr         5f1459dc    2015-01-13  Matthias Fuchs <matthias.fuchs@esd.eu>
 CPCI405AB        ppc4xx      405gpr         5f1459dc    2015-01-13  Matthias Fuchs <matthias.fuchs@esd.eu>
diff --git a/doc/git-mailrc b/doc/git-mailrc
index d90793a..8ba599c 100644
--- a/doc/git-mailrc
+++ b/doc/git-mailrc
@@ -98,8 +98,6 @@
 alias mpc85xx        uboot, afleming, galak
 alias mpc86xx        uboot, afleming, galak
 alias ppc4xx         uboot, stroese
-alias ppc7xx         uboot, wd
-alias ppc74xx        uboot, wd
 
 alias sandbox        sjg
 alias sb             sandbox