fix bug on the realization path of printf function

[wanermian]

1、modify the store address in fputc function.
2、modify the PMA of the store address to Strong Order according to smart testbench.
3、remove the redefine of printc under clib directory.

[mp-17]

Reference issue: #2
I am not sure that the sysmap.h should be the same of the C910, maybe it was different for a reason?
As a patch, it is also possible to do the following:

1. If you just need to have a working printf, change this address and this address to 0x90000000.
2. To avoid possible errors with custom programs, remove this file.

[wanermian]

Reference issue: #2 I am not sure that the sysmap.h should be the same of the C910, maybe it was different for a reason? As a patch, it is also possible to do the following:

1. If you just need to have a working printf, change this address and this address to 0x90000000.
2. To avoid possible errors with custom programs, remove this file.

The SoC demo of C906 is similar to C910. In addition, address 0x9000_0000 falls in the ERR2 interval which may results in bus error.

[mp-17]

Agree, I used 0x90000000 since no errors were thrown. If there was no reason for the initial choice of sysmap.h, it's fine. Thanks for the PR! :-)

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