arm-mmp2: s/create cl4/create mmp3/

This is a trivial rename.

The cl4 word conditionalizes things that are specific to MMP3, not the just
OLPC CL4 machine. Using the cl4 name outside OLPC would be misleading.
diff --git a/src/app/arm-mmp2/lcd.fth b/src/app/arm-mmp2/lcd.fth
index 202c29b..d044d5b 100644
--- a/src/app/arm-mmp2/lcd.fth
+++ b/src/app/arm-mmp2/lcd.fth
@@ -1,4 +1,4 @@
-[ifdef] cl4
+[ifdef] mmp3
 \ This value has the same effect as the value below.  The
 \ difference is that the SCLK_SOURCE_SELECT field added a
 \ low-order bit (bit 29), so the high nibble changed from
diff --git a/src/app/arm-xo-1.75/boardgpio.fth b/src/app/arm-xo-1.75/boardgpio.fth
index 4714460..dc4c486 100644
--- a/src/app/arm-xo-1.75/boardgpio.fth
+++ b/src/app/arm-xo-1.75/boardgpio.fth
@@ -24,7 +24,7 @@
    led-storage-gpio#    gpio-dir-out
 [then]
 
-[ifdef] cl4
+[ifdef] mmp3
    vid2-gpio#           gpio-out-set
 [else]
    vid2-gpio#           gpio-out-clr
diff --git a/src/app/arm-xo-1.75/showpmu.fth b/src/app/arm-xo-1.75/showpmu.fth
index 5b19b7b..e6ea19d 100644
--- a/src/app/arm-xo-1.75/showpmu.fth
+++ b/src/app/arm-xo-1.75/showpmu.fth
@@ -46,7 +46,7 @@
    ." PJ_ISR     " h#   a0 p.8  ." MC_HW_SLP" h#   b0 p.8  ." MC_SLP_REQ " h#   b4 p.8  cr
    ." MC_SW_SLP  " h#   c0 p.8  ." PLL_SEL  " h#   c4 p.8  ." PWR_ONOFF  " h#   e0 p.8  cr
    ." PWR_TIMER  " h#   e4 p.8  ." MC_PAR   " h#  11c p.8  cr
-[ifdef] cl4
+[ifdef] mmp3
    \ some of these might exist on mmp2 as well
    ." CC2_PJ     " h#  150 p.8  ." CC3_PJ   " h#  188 p.8  ." DEBUG2     " h#  190 p.8 cr
 [then]
@@ -60,7 +60,7 @@
    ." CCIC2_RES  " h#   f4 p.8  ." HSI_RES  " h#  108 p.8  ." AUDIO_RES  " h#  10c p.8  cr
    ." DISP2_RES  " h#  110 p.8  ." CCIC2_RES" h#  118 p.8  ." ISP_RES    " h#  120 p.8  cr
    ." EPD_RES    " h#  124 p.8  ." APB2_RES " h#  134 p.8  cr
-[ifdef] cl4
+[ifdef] mmp3
    \ some of these might exist on mmp2 as well
    ." IDLE_CFG2  " h#  200 p.8  ." IDLE_CFG3" h#  204 p.8  ." ISL_POWER  " h#  220 p.8  cr
    ." ==Other Controls==" cr
diff --git a/src/app/arm-xo-cl4/app.fth b/src/app/arm-xo-cl4/app.fth
index d4c8f97..eb0d8c5 100644
--- a/src/app/arm-xo-cl4/app.fth
+++ b/src/app/arm-xo-cl4/app.fth
@@ -1,4 +1,4 @@
-create cl4  \ OLPC XO-CL4
+create mmp3  \ MMP3-based OLPC XO-CL4
 
 h#   10.0000 constant /rom
 h# 08fe.0000 constant dlofw-base