Fix some bugs on RV32 build fail and issue

This patches contain the modificaion as follows:
1. Fix up the building fail on RV32.
2. Add umoddi3 and udivmoddi4 functions for RV32.
3. Fix ioremap problem on RV32.

Thanks all for review these code and modify the copyright description.

Changes in v4:
- Retain the complete copyright description.
- Modify commit message.
- Rebase upstream code.

Changes in v3:
- Change the copyright notices to GPLv2 from gcc 4.2.1.

Changes in v2:
- Retain the copyright notices from libgcc in umoddi3.c and udivmoddi4.c.

Vincent Chen (1):
RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap

Zong Li (4):
RISC-V: Build tishift only on 64-bit
RISC-V: Add preprocessor directive for swiotlb
lib: Add umoddi3 and udivmoddi4 of GCC library routines
RISC-V: Select GENERIC_LIB_UMODDI3 on RV32

 arch/riscv/Kconfig        |   1 +
 arch/riscv/kernel/setup.c |   3 +
 arch/riscv/lib/Makefile   |   3 +-
 arch/riscv/mm/ioremap.c   |   2 +-
 lib/Kconfig               |   3 +
 lib/Makefile              |   1 +
 lib/udivmoddi4.c          | 326 ++++++++++++++++++++++++++++++++++++++++++++++
 lib/umoddi3.c             |  48 +++++++
 8 files changed, 385 insertions(+), 2 deletions(-)
 create mode 100644 lib/udivmoddi4.c
 create mode 100644 lib/umoddi3.c

2.7.4