arch: powerpc: revert CROSS_COMPILE to powerpc64le-linux-gnu-

The powerpc64-linux-gnu cross-compiler package only exists on
amd64 hosts in Debian. Container builds on arm64 fail because
the package is not available.

Switch back to powerpc64le-linux-gnu-. The korg-gcc toolchain
is not affected since it downloads its own tarball and sets
CROSS_COMPILE from the korg path.

Fixes: 4a5776c ("arch: powerpc: switch CROSS_COMPILE to powerpc64-linux-gnu-")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>

Author: roxell

docs/architectures.md

@@ -27,7 +27,7 @@ mips         |             | 32-bit MIPS              | yes¹ ³   | yes
 nios2        |             | 32-bit RISC              | yes³     | no
 openrisc     |             | OpenRISC                 | no¹ ³    | no
 parisc       |             | 64-bit parisc            | yes¹ ²   | no
-powerpc      |             | 64-bit PowerPC           | yes¹ ² ³ | yes
+powerpc      |             | 64-bit PowerPC (EL)      | yes¹ ² ³ | yes
 riscv        |             | 64-bit RISC-V            | yes¹ ² ³ | no
 s390         | *s390x*     | 64-bit IBM S/390         | yes      | yes
 sh           |             | 32-bit sh4               | yes¹     | no

tuxmake/arch/powerpc.ini

@@ -3,7 +3,7 @@ kernel = zImage
 
 [makevars]
 ARCH = powerpc
-CROSS_COMPILE = powerpc64-linux-gnu-
+CROSS_COMPILE = powerpc64le-linux-gnu-
 
 [artifacts]
 kernel = arch/powerpc/boot/{kernel}