This adds the following commits from upstream:

0a3a9d3449c8 checks: Add an interrupt-map check
8fd24744e361 checks: Ensure '#interrupt-cells' only exists in interrupt providers
d8d1a9a77863 checks: Drop interrupt provider '#address-cells' check
52a16fd72824 checks: Make interrupt_provider check dependent on interrupts_extended_is_cell
37fd700685da treesource: Maintain phandle label/path on output
e33ce1d6a8c7 flattree: Use '\n', not ';' to separate asm pseudo-ops
d24cc189dca6 asm: Use assembler macros instead of cpp macros
ff3a30c115ad asm: Use .asciz and .ascii instead of .string
5eb5927d81ee fdtdump: fix -Werror=int-to-pointer-cast
0869f8269161 libfdt: Add ALIGNMENT error string
69595a167f06 checks: Fix bus-range check
72d09e2682a4 Makefile: add -Wsign-compare to warning options
b587787ef388 checks: Fix signedness comparisons warnings
69bed6c2418f dtc: Wrap phandle validity check
910221185560 fdtget: Fix signedness comparisons warnings
d966f08fcd21 tests: Fix signedness comparisons warnings
ecfb438c07fa dtc: Fix signedness comparisons warnings: pointer diff
5bec74a6d135 dtc: Fix signedness comparisons warnings: reservednum
24e7f511fd4a fdtdump: Fix signedness comparisons warnings
b6910bec1161 Bump version to v1.6.1
21d61d18f968 Fix CID 1461557
4c2ef8f4d14c checks: Introduce is_multiple_of()
e59ca36fb70e Make handling of cpp line information more tolerant
0c3fd9b6aceb checks: Drop interrupt_cells_is_cell check
6b3081abc4ac checks: Add check_is_cell() for all phandle+arg properties
2dffc192a77f yamltree: Remove marker ordering dependency
61e513439e40 pylibfdt: Rework "avoid unused variable warning" lines
c8bddd106095 tests: add a positive gpio test case
ad4abfadb687 checks: replace strstr and strrchr with strends
09c6a6e88718 dtc.h: add strends for suffix matching
9bb9b8d0b4a0 checks: tigthen up nr-gpios prop exception
b07b62ee3342 libfdt: Add FDT alignment check to fdt_check_header()
a2def5479950 libfdt: Check that the root-node name is empty
4ca61f84dc21 libfdt: Check that there is only one root node
34d708249a91 dtc: Remove -O dtbo support
8e7ff260f755 libfdt: Fix a possible "unchecked return value" warning
88875268c05c checks: Warn on node-name and property name being the same
9d2279e7e6ee checks: Change node-name check to match devicetree spec
f527c867a8c6 util: limit gnu_printf format attribute to gcc >= 4.4.0
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Tested-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>